Threading die



April `13 1926. n

J. R. sAYLoR;

THREADING mE .Filed May 18. 1925 mom/MJ 1 u mi# .NN ancumfllfidt A M, ill. Y l .Q

Patented Apr. i3, 192552.

ltill QFFitE.

Joann. sAYLon, orrorrsrovrit, snnnsvvanra.

THRELAIDING? DIE.

applicati@ sied. May-1s, 1925. serial no. 31,112.

To all whom it may concer-n Be it known that I, Jorrit R. Sarnen, a citizen of the United States, residing in Pottstown, Montgomery County, Pennsylvania, have invented certain Improvements in Threading Dies, of which the following is a specification. c

My inventiony relates to certain improve. ments in dies vfor cutting screw threads upon pipes, rods, &c.

The object of the invention is to'construct a threading die in such a manner that the chasers can be locked in position by one set of screws and can-be adjust-ed to take up for wear without releasing the chasers from engagementwith the threaded bo'dy portion.

In the accompanying drawings: l

Fig. 1 is a side view of my improved die;

Fig. 2 is a longitudinal sectional view;

Fig. B is an end view;

Fig. i is a transverse sectional view on the line lne, Fig. 2;

Fig. 5 is a transverse sectional view on the line LV1-5, Fig. 2; and

Fig. 6 is a diagram showing the relation of the adjusting screwsV and the locking screws in respect to the screw threaded stem.

The body 1 ofthe die has a portion 2, which is adapted to be secured in any type of threading machine. On the body 1 is a flange 3. Beyond the flange is a slotted portion l1. rEhe longitudinal slots 5 in the portion l are of a width to receive the rear ends of the chasers G. Gn the end et the body 1, beyond the slotted portion fl, is a threaded projection 7. A portion 8 of this projection is tapered and a portion 9 is ot an even diameter. A shell 10 has a portion 10 shown by dotted lines in Fig. 2 and in Fig. Ll. ln this portion is a threaded opening into which is screwed the threaded projection 7. The shell has longitudinal internal slots 11 in line with the slots in the body portion.

The chasers 6 tit the slots 11, as shown in Fig. Li, and are held against lateral movement. The threads cut in the chasersengage the threads onthe projection 7, and are held against longitudinal movement by said projection.

The opening in the iront ot the shell is enlarged, as at 12, to allow clearance tor the chips and to allow 'for a certain amount of adjustment for the chasers. rlfhe chasers 6 are locked to the projection 7 of the. body 1 by locking screws 13, which bear against the back edges ot the chasers, as. shown in Figs. 2 and t. rlhe screws are preferably ona line directly back of the point i, where the tapered portion 8 of the projection T merges in the portion 9 of even ldiameter, Fig. 6.

In front of the locking screws 13 are adjusting screws 14, which bearnpon the back edges of the chasers near the -front oi the die, as shown in Fig/2. By this construction, the chasers can be moved towards or from each other by manipulating the adjusting screws 14. The chasers rock to al certain extent on the threaded projection When the two screws ot each Chaser are properly adjusted, theV chasers are held .tirmly in the body portion and shell. By baching oil' both screws 18 and 14, a chaser can be readily removed from the die, or can be adjusted longitudinally therein.

When a Chaser is located in a die, and its thread is in engagement with the thread of the body, then it is in proper alignment with the other chasers and the locking` screw can be turned until the ch aser is firmly held.

The adjusting screw 13 can be turned until the outer end ot' the Chaser is in position to cut a thread.

It will be seen from the improvements here'inbetore described that the adjustments of the chasers can be made without. disturb their connection with the/body portion. 3y backing ott the screw 13, the chasers can .be adjusted longitudinally, or they can be removed w j ustm ent.

l claim:

l.. The combinaton in a threading die, oi" a slotted bonyrportion having a. threaded projection; a slotted shell secured to the body j; ortion and enclosing the threaded projection; series of chai-:ers mounted in the slots ot the body andshell and engaging the threads on the project-ion, and two sets or screws, one set locking the chasers to the body, and the other set being arranged to adjust the chasers towards and from the center of the dic.

2. The combination in a threading die, oi a body portion having a series ot longitudinal slots therein and'having a threaded extension; a shell secured to the body and having longitudinal slots aligning with those of the body; chasers located in the slots ot the body and the shell, the threads of the chasers engaging the thread on the extension .rout changing the cutting adof the body; a looking screw for yeaoh Chaser a body having a series of longitudinal slots therein and having an extension, said eXtension having a section of even 'diameter and having a tapered section, said sections hav- 10 ing a Vsereiv thread th'ereon; a shellvseoure'd to the body and enclosing the threaded extension, said shell having longitudinal slots in lline With those of the body; chasers mounted in the slots; lookingsorews in the shell arranged to 'bear Vupon the back 'of the vehaser in a line with the tapered portion of the projection of rthe body; and adjusting -screws inthe shell bearing on thev chasers in front of the locking screws.

' vJOHN R. SAYLOR. 

